What followed was the famous Jerusalem Counsel. A heated debate ensued before the church leaders in Jerusalem, before the very apostles who had walked with Christ and learned from Him. The enemies of grace realized that if they lost the circumcision debate, if a man could live in rebellion to God and still be saved through faith in Christ, then the entire law of Moses was unnecessary for salvation! They realized that the issue of circumcision and the entire law of Moses would stand or fall together: They pressed their case to the church leaders:
But some of the sect of the Pharisees who believed rose up, saying, "It is necessary to circumcise them, and to command them to keep the law of Moses.
Acts 15:5
For Paul and other true believers, nothing less than the doctrine of grace was at stake! After hearing the matter, Peter stood up and gave the decision of the council:
So the apostles and elders came together to consider this matter. And when there had been much dispute, Peter rose up and said to them: "Men and brethren, you know that a good while ago God chose among us, that by my mouth the Gentiles should hear the word of the gospel and believe. So God, who knows the heart, acknowledged them, by giving them the Holy Spirit just as He did us, and made no distinction between us and them, purifying their hearts by faith. Now therefore, why do you test God by putting a yoke on the neck of the disciples which neither our fathers nor we were able to bear. But we believe that through the grace of the Lord Jesus Christ we shall be saved in the same manner as they.
Acts 15:6-11
The council affirmed that Gentiles were saved by hearing "the word of the gospel and believ[ing]" that God "purifies their hearts by faith"; that it was not right to put the "yoke" of the law around the necks of the Gentiles; and that "through the grace of our Lord Jesus Christ we shall be saved." The council further affirmed that they had never endorsed those who went out and preached that circumcision or obedience to the law of Moses was necessary for salvation!
Since we have heard that some who went out from us have troubled you with words, unsettling your souls, saying, "You must be circumcised and keep the law" - to whom we gave no such commandment.
Acts 15:24
In short, the other apostles defended Paul's doctrine of grace. A man is saved by faith in Christ apart from the works of the law!